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प्रश्न
Name the following:
The process in which an ore is heated in air so that oxygen gets added to it to form the oxides.
उत्तर
Roasting.
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संबंधित प्रश्न
Which metal becomes black in the presence of hydrogen sulphide gas in air?
Name the metal which is extracted from haematite ore.
The articles made of silver metal become dark on prolonged exposure to air. This is due to the formation of a layer of its:
(a) oxide
(b) hydride
(c) sulphide
(d) carbonate
An element A which is a part of common salt and kept under kerosene reacts with another element B of atomic number 17 to give a product C. When an aqueous solution of product C is electrolysed then a compound D is formed and two gases are liberated.
(a) What are A and B?
(b) Identify C and D.
(c) What will be the action of C on litmus solution? Why?
(d) Write formula of the compound formed when element B reacts with an element E having atomic number 5.
Give the principles of the hydrolytic method.
Explain the following:
Galvanization protects iron from rusting.
choose the most appropriate term to match the given description.
Heating of the ore in the absence of air to high temperature
Name the methods by which concentrated ore is converted to metallic oxide.
Define roasting.
Which of the following metals exist in their native state in nature?
(i) Cu
(ii) Au
(iii) Zn
(iv) Ag
